find puntual maximum in a 3D array.

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Fernando Arias 2018-6-11

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https://ww2.mathworks.cn/matlabcentral/answers/405045-find-puntual-maximum-in-a-3d-array

回答： Sam Cook 2018-6-13

Hi, I have a 3D array with values of intensity in each voxel. Now I need to find some point sources of intensity that are inside de array, The problem is that there are other voxels with more intensity but they aren't puntual sources.

I add an image of a sagital plane that show which local maximum I want to find.

If I would have only one dimension datas I would use findpeacks and the information of width at half prominence, but I'm lost doing it in a 3D array.

Thank you for your time.

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Answer 1

Sam Cook 2018-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/405045-find-puntual-maximum-in-a-3d-array#answer_324532

在 MATLAB Online 中打开

If you're looking for the local maxima, and you have the Image Processing Toolbox, you can use the imregionalmax function. It returns a logical matrix that identifies the points that you need. From there, you can determine which regions you are specifically looking for.

[X,Y] = meshgrid(0:0.5:10, 0:0.5:10);
Z = min(cos(X) + sin(Y), 1.5);
surf(X, Y, Z);
ix = imregionalmax(Z);
hold on
scatter3(X(ix), Y(ix), Z(ix), 'r', 'LineWidth', 5);